Theoretical analysis of the hydration of fly ash cement

Abstract

In order to analysis the hydration reaction of fly ash cement, extended Tomozawa-s equation which considers the particle size distribution was applied to the reaction process of mixed system consisting of fly ash and ordinary Portland cement. By measuring the pozzolanic reaction of fly ash and the hydration reaction of ordinary Portland cement, the interaction between each reaction in fly ash cement was quantitatively analyzed. We also derived an equation to analyze the theoretical porosity of the fly ash cement based on the hydration reaction of the mixed system, and applied it to calculate the time dependence of porosity of the fly ash cement. Comparison of the simulated porosity with experimental values revealed that the porosity tend to increase with fly ash content, and after one year of aging, has almost no dependence on the vitrification rate of the fly ash.